[interpreter] move the dispatch table off heap.

src/mips/builtins-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1019 matching lines @@
   //  - Call ProfileEntryHookStub when isolate has a function_entry_hook.
   //  - Allow simulator stop operations if FLAG_stop_at is set.
   //  - Code aging of the BytecodeArray object.
 
   // Load bytecode offset and dispatch table into registers.
   __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
   __ Addu(kInterpreterRegisterFileRegister, fp,
           Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ li(kInterpreterBytecodeOffsetRegister,
         Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
-  __ Addu(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
-          Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ li(kInterpreterDispatchTableRegister,
+        Operand(ExternalReference::interpreter_dispatch_table_address(
+            masm->isolate())));
 
   // Dispatch to the first bytecode handler for the function.
   __ Addu(a0, kInterpreterBytecodeArrayRegister,
           kInterpreterBytecodeOffsetRegister);
   __ lbu(a0, MemOperand(a0));
   __ Lsa(at, kInterpreterDispatchTableRegister, a0, kPointerSizeLog2);
   __ lw(at, MemOperand(at));
   // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
   // and header removal.
   __ Addu(at, at, Operand(Code::kHeaderSize - kHeapObjectTag));
@@ skipping 80 matching lines @@
   __ bind(&loop_check);
   __ Branch(&loop_header, gt, a2, Operand(t0));
 
   // Call the constructor with a0, a1, and a3 unmodified.
   __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
 }
 
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
-  __ Addu(kInterpreterRegisterFileRegister, fp,
-          Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
-  __ LoadRoot(kInterpreterDispatchTableRegister,
-              Heap::kInterpreterTableRootIndex);
+  __ li(kInterpreterDispatchTableRegister,
+        Operand(ExternalReference::interpreter_dispatch_table_address(
+            masm->isolate())));
   __ Addu(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
           Operand(FixedArray::kHeaderSize - kHeapObjectTag));
 
   // Get the context from the frame.
   __ lw(kContextRegister,
         MemOperand(kInterpreterRegisterFileRegister,
                    InterpreterFrameConstants::kContextFromRegisterPointer));
 
   // Get the bytecode array pointer from the frame.
   __ lw(a1,
@@ skipping 1608 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS